JPH0874889A - Spring type one-way clutch - Google Patents

Abstract

PURPOSE: To rapidly shorten/enlarge the diameters of respective coil springs so that the responsiveness of a spring type one-way clutch can be improved by providing the coil springs to tighten an inner member, between the inner member and an outer member, dividing the coil springs into a plurality of unit coil springs, and connecting one end of each unit coil spring to the outer member. CONSTITUTION: A plurality of dextral unit coil springs 2 are fitted to an inner member 1 having predetermined margines, and are stored inside an outer member 3. Engagement shaft parts 4 which are faced in a diametral direction are provided to one end of each unit coil spring 2, and are engaged with grooves 5 formed on the inner diametral surface of the outer member 3 so that respective unit coil springs 2 and the outer member 3 are rotated together. As each one end of each unit coil spring 2 whose number of windings is few, is connected to the outer member 3, force to strengthen or loosen for winding around coils rapidly affect the other end side of each unit coil spring 2, so that the diameters of respective unit coil springs 2 are rapidly shortened/enlarged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention is mainly applied to copying machines and F
The present invention relates to a spring type one-way clutch for torque transmission / disconnection used in OA equipment such as AX.

[0002]

2. Description of the Related Art An example of a conventional spring type one-way clutch is shown in FIGS. The right-handed coil spring 51 that tightens the input shaft 50 is housed inside a cylindrical output-side member 52. An engaging shaft portion 53 extending in the radial direction is provided at one end of the coil spring 51, and the engaging shaft portion 53 is engaged with a groove 54 formed in the output side member 52 to output the coil spring 51 and the output. Side member 52
And are designed to rotate together. A lid 56 for preventing the coil spring 51 from coming off is provided in the opening 55 of the output side member 52.
Is fitted.

Now, when the input shaft 50 is rotated counterclockwise as viewed from the direction of the arrow in FIG. 3, the outer diameter surface of the input shaft 50 and the coil spring 5 are rotated.
Due to the friction with the inner diameter surface of No. 1, a force for strengthening the winding of the coil acts on the coil spring 51. Therefore, the coil spring 51
Tends to reduce its diameter, the contact pressure between the coil spring 51 and the input shaft 50 increases, and the coil spring 51 and the input shaft 50 rotate together. Therefore, the torque applied to the input shaft 50 is output via the coil spring 51. It is transmitted to the side member 52.

On the other hand, when the input shaft 50 is rotated clockwise as viewed from the direction of the arrow in FIG. 5, the outer diameter surface of the input shaft 50 and the coil spring 5 are rotated.
Due to the friction with the inner diameter surface of No. 1, a force for loosening the coil winding acts on the coil spring 51, and the coil spring 51 tries to expand the diameter. Therefore, the contact pressure between the coil spring 51 and the input shaft 50 becomes low, slippage occurs between the coil spring 51 and the input shaft 50, the torque of the input shaft 50 is cut off, and is not transmitted to the output side member 52.

[0005]

However, in the one-way clutch as described above, when the number of turns of the coil spring 51 is large, it takes time for the coil spring 51 to reduce or expand its diameter over its entire length, and the input There is a problem that the response of torque transmission / interruption according to the change of the rotation direction of the shaft 50 is delayed.

Therefore, an object of the present invention is to provide a spring type one-way clutch having excellent responsiveness.

[0007]

In order to solve the above-mentioned problems, the present invention provides a coil spring for tightening an inner member between an inner member and an outer member, and an inward member is provided via the coil spring. In the spring type one-way clutch that transmits torque between the member and the outer member, the coil spring is divided into a plurality of unit coil springs, and one end of each unit coil spring is connected to the outer member. is there.

[0008]

Since one end of each unit coil spring having a small number of turns is connected to the outer member, the force for winding the coil or the coil winding is increased according to the change in the rotating direction of the inner member or the outer member. The force for loosening the component rapidly spreads to the other end side of each unit coil spring, and each unit coil spring rapidly contracts or expands in diameter.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIGS. 1 and 2, a plurality of right-handed unit coil springs 2 are fitted to the inner member 1 with a predetermined interference, and each unit coil spring 2 is housed inside the outer member 3. There is. As the inner member 1, a shaft is shown here.

An engaging shaft portion 4 is provided at one end of each unit coil spring 2, and the engaging shaft portion 4 is oriented in the radial direction.
The unit coil springs 2 and the outer member 3 are adapted to rotate together by being engaged with the groove 5 formed on the inner diameter surface of the outer member 3.

A lid 7 for preventing the unit coil spring 2 from coming off is press-fitted into the opening 6 of the outer member 3.

Now, when the inner member 1 is rotated counterclockwise as viewed in the direction of the arrow in FIG. 1, the winding of the coil is strengthened by the friction between the outer diameter surface of the inner member 1 and the inner diameter surface of each unit coil spring 2. The force acts on each unit coil spring 2. Therefore, each unit coil spring 2 tries to reduce its diameter, the contact pressure between each unit coil spring 2 and the inner member 1 increases, and each unit coil spring 2 and the inner member 1 rotate together. The torque applied to 1 is transmitted to the outer member 3 via each unit coil spring 2.

On the other hand, when the inner member 1 is rotated clockwise when viewed from the direction of the arrow in FIG. 1, the coil winding is loosened by the friction between the outer diameter surface of the inner member 1 and the inner diameter surface of each unit coil spring 2. Since the force acts on each unit coil spring 2, each unit coil spring 2 tries to expand its diameter. Therefore, the contact pressure between each unit coil spring 2 and the inner member 1 becomes low, slippage occurs between each unit coil spring 2 and the inner member 1, and the torque of the inner member 1 is cut off and the outer member 1 is blocked. It is not transmitted to the member 3.

In order to make the unit coil springs 2 and the inner member 1 slide smoothly, grease may be filled between the unit coil springs 2 and the inner member 1.

As described above, in the one-way clutch according to the present invention, the plurality of unit coil springs 2 for fastening the inner member 1 are provided. Therefore, only one coil spring 51 is provided as in the conventional example shown in FIG. The number of turns per unit coil spring 2 can be reduced as compared with the one used.

Since one end of each unit coil spring 2 having a small number of turns is connected to the outer member 3, the force for enforcing the coil winding or the coil winding is increased according to the fluctuation of the rotation of the inner member 1. The loosening force quickly spreads to the other end side of each unit coil spring 2, and each unit coil spring 2 rapidly contracts or expands in diameter.

When the winding direction of each unit coil spring 2 is left-handed, the rotation direction of the inner member 1 in which torque is transmitted to and blocked from the outer member 3 is opposite to the above example.

Further, the rotation of the inner member 1 can be transmitted to the outer member 3 until the diameter of each unit coil spring 2 is expanded and slippage occurs between the unit coil spring 2 and the inner member 1. By adjusting the tightening margin between the unit coil spring 2 and the inner member 1, it is possible to set a transmittable torque value and use it as a one-way torque limiter.

In the above operation example, the inner member 1 is used as the input side and the outer member 3 is used as the output side, but the outer member 3 is used.
Even if the input side is the input side and the inner member 1 is the output side, it can be used as a one-way clutch or a one-way torque limiter by the same operation as above.

[0020]

As described above, according to the present invention, the coil spring for tightening the inner member is divided into a plurality of unit coil springs, and one end of each unit coil spring is connected to the outer member. Or, in accordance with the change in the rotating direction of the outer member, the force that strengthens the coil winding or the force that loosens the coil quickly spreads to the other end side of each unit coil spring,
The diameter of each unit coil spring is rapidly reduced or expanded.

Therefore, the transmission and interruption of the torque can be rapidly switched and the response is excellent.

Further, since the torque is distributed to the plurality of unit coil springs, it is possible to cope with a large torque while being compact.

Further, since the structure is simple, it is easy to assemble and can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment.

FIG. 2 is an exploded perspective view of the above.

FIG. 3 is a sectional view of a conventional example.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

[Explanation of symbols]

 1 Inner member 2 Unit coil spring 3 Outer member

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[Procedure amendment]

[Submission date] September 13, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

On the other hand, when the input shaft 50 is rotated clockwise as seen from the direction of the arrow in FIG. 3 , the outer diameter surface of the input shaft 50 and the coil spring 5 are rotated.
Due to the friction with the inner diameter surface of No. 1, a force for loosening the coil winding acts on the coil spring 51, and the coil spring 51 tries to expand the diameter. Therefore, the contact pressure between the coil spring 51 and the input shaft 50 becomes low, slippage occurs between the coil spring 51 and the input shaft 50, the torque of the input shaft 50 is cut off, and is not transmitted to the output side member 52.

Claims (1)

[Claims] 1. A spring-type one-way, wherein a coil spring for tightening the inner member is provided between the inner member and the outer member, and torque is transmitted between the inner member and the outer member via the coil spring. In the clutch, the coil spring is divided into a plurality of unit coil springs, and one end of each unit coil spring is connected to an outer member.